WaveEnergy

WaveEnergy - 15-5 Energy in Wave Motion 1 dimensional wave...

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Liu UCD Phy9B 07 22 15-5. Energy in Wave Motion x t x y F t x F y = ) , ( ) , ( t t x y x t x y F t x v t x F t x P y y = = ) , ( ) , ( ) , ( ) , ( ) , ( For any wave on a string, instantaneous rate of energy transfer 1 dimensional: wave on a string
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Liu UCD Phy9B 07 23 Energy Transferred by Sinusoidal Wave ) cos( ) , ( t kx A t x y ω = For a sinusoidal wave ) ( sin ) , ( 2 2 t kx A Fk t x P = ) ( sin 2 2 2 t kx v A F = ) ( sin / 2 2 2 t kx F A F µ = 2 2 max A F P = 2 2 2 1 A F P av = ) ( sin ) , ( 2 2 2 t kx A F t x P =
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Liu UCD Phy9B 07 24 Energy Transported by Wave 2 area power area e energy/tim I Intensity A = = Point source, isotropic medium - Spherical Wave 2 4 I r P π = _________ I=I o at r, I at 2r? Power transported by wave per unit area, perpendicular to the propagation direction: 3 dimensional wave 2 1 2 2 2 1 r r I I =
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Liu UCD Phy9B 07 25 Fixed end Free end
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This note was uploaded on 02/17/2009 for the course PHY na taught by Professor Richardscalettar during the Spring '09 term at UC Davis.

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WaveEnergy - 15-5 Energy in Wave Motion 1 dimensional wave...

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